forked from Minki/linux
d2912cb15b
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
260 lines
6.3 KiB
C
260 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Generic GPIO card-detect helper
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*
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* Copyright (C) 2011, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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*/
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#include <linux/err.h>
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#include <linux/gpio/consumer.h>
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/slot-gpio.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include "slot-gpio.h"
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struct mmc_gpio {
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struct gpio_desc *ro_gpio;
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struct gpio_desc *cd_gpio;
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bool override_cd_active_level;
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irqreturn_t (*cd_gpio_isr)(int irq, void *dev_id);
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char *ro_label;
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char *cd_label;
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u32 cd_debounce_delay_ms;
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};
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static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
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{
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/* Schedule a card detection after a debounce timeout */
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struct mmc_host *host = dev_id;
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struct mmc_gpio *ctx = host->slot.handler_priv;
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host->trigger_card_event = true;
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mmc_detect_change(host, msecs_to_jiffies(ctx->cd_debounce_delay_ms));
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return IRQ_HANDLED;
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}
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int mmc_gpio_alloc(struct mmc_host *host)
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{
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struct mmc_gpio *ctx = devm_kzalloc(host->parent,
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sizeof(*ctx), GFP_KERNEL);
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if (ctx) {
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ctx->cd_debounce_delay_ms = 200;
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ctx->cd_label = devm_kasprintf(host->parent, GFP_KERNEL,
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"%s cd", dev_name(host->parent));
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if (!ctx->cd_label)
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return -ENOMEM;
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ctx->ro_label = devm_kasprintf(host->parent, GFP_KERNEL,
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"%s ro", dev_name(host->parent));
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if (!ctx->ro_label)
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return -ENOMEM;
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host->slot.handler_priv = ctx;
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host->slot.cd_irq = -EINVAL;
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}
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return ctx ? 0 : -ENOMEM;
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}
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int mmc_gpio_get_ro(struct mmc_host *host)
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{
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struct mmc_gpio *ctx = host->slot.handler_priv;
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if (!ctx || !ctx->ro_gpio)
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return -ENOSYS;
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return gpiod_get_value_cansleep(ctx->ro_gpio);
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}
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EXPORT_SYMBOL(mmc_gpio_get_ro);
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int mmc_gpio_get_cd(struct mmc_host *host)
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{
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struct mmc_gpio *ctx = host->slot.handler_priv;
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int cansleep;
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if (!ctx || !ctx->cd_gpio)
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return -ENOSYS;
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cansleep = gpiod_cansleep(ctx->cd_gpio);
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if (ctx->override_cd_active_level) {
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int value = cansleep ?
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gpiod_get_raw_value_cansleep(ctx->cd_gpio) :
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gpiod_get_raw_value(ctx->cd_gpio);
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return !value ^ !!(host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH);
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}
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return cansleep ?
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gpiod_get_value_cansleep(ctx->cd_gpio) :
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gpiod_get_value(ctx->cd_gpio);
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}
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EXPORT_SYMBOL(mmc_gpio_get_cd);
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void mmc_gpiod_request_cd_irq(struct mmc_host *host)
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{
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struct mmc_gpio *ctx = host->slot.handler_priv;
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int irq = -EINVAL;
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int ret;
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if (host->slot.cd_irq >= 0 || !ctx || !ctx->cd_gpio)
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return;
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/*
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* Do not use IRQ if the platform prefers to poll, e.g., because that
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* IRQ number is already used by another unit and cannot be shared.
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*/
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if (!(host->caps & MMC_CAP_NEEDS_POLL))
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irq = gpiod_to_irq(ctx->cd_gpio);
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if (irq >= 0) {
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if (!ctx->cd_gpio_isr)
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ctx->cd_gpio_isr = mmc_gpio_cd_irqt;
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ret = devm_request_threaded_irq(host->parent, irq,
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NULL, ctx->cd_gpio_isr,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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ctx->cd_label, host);
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if (ret < 0)
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irq = ret;
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}
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host->slot.cd_irq = irq;
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if (irq < 0)
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host->caps |= MMC_CAP_NEEDS_POLL;
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}
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EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);
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int mmc_gpio_set_cd_wake(struct mmc_host *host, bool on)
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{
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int ret = 0;
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if (!(host->caps & MMC_CAP_CD_WAKE) ||
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host->slot.cd_irq < 0 ||
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on == host->slot.cd_wake_enabled)
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return 0;
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if (on) {
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ret = enable_irq_wake(host->slot.cd_irq);
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host->slot.cd_wake_enabled = !ret;
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} else {
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disable_irq_wake(host->slot.cd_irq);
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host->slot.cd_wake_enabled = false;
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}
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return ret;
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}
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EXPORT_SYMBOL(mmc_gpio_set_cd_wake);
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/* Register an alternate interrupt service routine for
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* the card-detect GPIO.
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*/
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void mmc_gpio_set_cd_isr(struct mmc_host *host,
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irqreturn_t (*isr)(int irq, void *dev_id))
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{
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struct mmc_gpio *ctx = host->slot.handler_priv;
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WARN_ON(ctx->cd_gpio_isr);
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ctx->cd_gpio_isr = isr;
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}
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EXPORT_SYMBOL(mmc_gpio_set_cd_isr);
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/**
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* mmc_gpiod_request_cd - request a gpio descriptor for card-detection
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* @host: mmc host
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* @con_id: function within the GPIO consumer
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* @idx: index of the GPIO to obtain in the consumer
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* @override_active_level: ignore %GPIO_ACTIVE_LOW flag
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* @debounce: debounce time in microseconds
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* @gpio_invert: will return whether the GPIO line is inverted or not, set
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* to NULL to ignore
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*
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* Note that this must be called prior to mmc_add_host()
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* otherwise the caller must also call mmc_gpiod_request_cd_irq().
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*
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* Returns zero on success, else an error.
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*/
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int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
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unsigned int idx, bool override_active_level,
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unsigned int debounce, bool *gpio_invert)
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{
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struct mmc_gpio *ctx = host->slot.handler_priv;
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struct gpio_desc *desc;
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int ret;
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desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);
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if (IS_ERR(desc))
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return PTR_ERR(desc);
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if (debounce) {
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ret = gpiod_set_debounce(desc, debounce);
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if (ret < 0)
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ctx->cd_debounce_delay_ms = debounce / 1000;
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}
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if (gpio_invert)
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*gpio_invert = !gpiod_is_active_low(desc);
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ctx->override_cd_active_level = override_active_level;
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ctx->cd_gpio = desc;
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return 0;
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}
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EXPORT_SYMBOL(mmc_gpiod_request_cd);
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bool mmc_can_gpio_cd(struct mmc_host *host)
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{
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struct mmc_gpio *ctx = host->slot.handler_priv;
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return ctx->cd_gpio ? true : false;
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}
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EXPORT_SYMBOL(mmc_can_gpio_cd);
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/**
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* mmc_gpiod_request_ro - request a gpio descriptor for write protection
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* @host: mmc host
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* @con_id: function within the GPIO consumer
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* @idx: index of the GPIO to obtain in the consumer
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* @debounce: debounce time in microseconds
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* @gpio_invert: will return whether the GPIO line is inverted or not,
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* set to NULL to ignore
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*
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* Returns zero on success, else an error.
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*/
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int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
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unsigned int idx,
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unsigned int debounce, bool *gpio_invert)
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{
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struct mmc_gpio *ctx = host->slot.handler_priv;
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struct gpio_desc *desc;
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int ret;
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desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);
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if (IS_ERR(desc))
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return PTR_ERR(desc);
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if (debounce) {
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ret = gpiod_set_debounce(desc, debounce);
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if (ret < 0)
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return ret;
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}
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if (gpio_invert)
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*gpio_invert = !gpiod_is_active_low(desc);
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ctx->ro_gpio = desc;
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return 0;
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}
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EXPORT_SYMBOL(mmc_gpiod_request_ro);
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bool mmc_can_gpio_ro(struct mmc_host *host)
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{
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struct mmc_gpio *ctx = host->slot.handler_priv;
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return ctx->ro_gpio ? true : false;
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}
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EXPORT_SYMBOL(mmc_can_gpio_ro);
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